Radio Programming and Tuning Procedures
4-7
4.4.4 Transmit Power Tuning
Perform the transmit high power tuning procedure as follows:
1.
Under the
Tx Align
menu, select
Transmit Power
, then select
K and M Tuning
.
2.
Select the
Power 1
box for the first frequency (F1).
3.
Press
PTT Toggle
to key up the radio.
4.
Observe the power level (W) displayed on the power meter. Record this value as
X
.
5.
Key in the value
X
in the
Power 1
box.
6.
Select the
Power 2
box for the first frequency (F1).
7.
Observe the power level (W) displayed on the power meter. Record this value as
Y
.
8.
Key in the value
Y
in the
Power 2
box.
9.
Press
PTT Toggle
again to dekey the radio.
10. Repeat Steps 2-9 for frequency points 2 to 7.
11. Press
Program
to store all keyed in values into the radio.
12. Exit the K and M tuning function.
4.4.5 Power Amplifier (PA) Voltage Limit Tuning (VHF 1-25W and UHF 1-25W LDMOS
radios only)
Perform the PA voltage limit tuning procedure as follows:
1.
Under the
Tx Align
menu, select
PA Voltage Limit
.
2.
Press
Auto Tune
and wait until all PA voltage limit softpots have been tuned.
3.
Exit the PA voltage limit tuning function.
Note: 1. Tuning of the PA BIAS must be performed first.
2. DAC Tuning must be performed first (LowBand radios only).
3. IMPORTANT: To set the transmitter power for customer applications use the Cus-
tomer Programming Software (CPS). The following procedure should only be per-
formed if transmitter components have been changed or the radio does not
transmit with the power set via the CPS. This tuning method is performed for mul-
tiple Transmit Power Tuning Channels.
4. The power values displayed after opening the screen may have a small rounding
offset.
5. When checking the RF power output of the radio with a test set, always use a pad
of at least 30dB attached to the radio end of the RF cable. This will avoid any RF
mismatch and ensure a stable RF reading that will not change with varying
lengths of connecting cable.
Note: 1. Tuning of the transmit power must be performed first.
2. This method automatically tunes all PA Voltage Limit Tuning Channels.
Summary of Contents for CDM1250
Page 1: ...CDM Series Professional Series Two Way Mobile Radio Basic Service Manual ...
Page 2: ......
Page 30: ... ...
Page 34: ...2 22 Service Aids Notes ...
Page 60: ...4 18 Radio Programming and Tuning Procedures Notes ...
Page 72: ...6 8 Accessories Notes ...
Page 86: ...7 14 Model Chart and Test Specifications NOTES ...
Page 90: ...Glossary 4 Glossary Notes ...
Page 91: ......
